Hart et al., 1981. Agronomy Journal, 73 (4): 737-743
Document reference
Hart, R. H. ; Thompson, A. J. III ; Elgin, J. H. Jr. ; McMurtrey, J. E. III, 1981. Forage yield and quality of Quaker comfrey, alfalfa, and orchardgrass. Agron. J., 73 (4): 737-743
